To authorities responsible for the measurement and distribution of time

INFORMATION ON UTC - TAI

NO positive leap second will be introduced at the end of December 2011. The difference between Coordinated Universal Time UTC and the International Atomic Time TAI is :

from 2009 January 1, 0h UTC, until further notice : UTC-TAI = -34 s

Leap seconds can be introduced in UTC at the end of the months of December or June, depending on the evolution of UT1-TAI. Bulletin C is mailed every six months, either to announce a time step in UTC, or to confirm that there will be no time step at the next possible date.